Steven,
If one doesn't pick a multicast address in the config file, how does corosync
pick the address to use? I have three different clusters, none of them specify
mcastaddr in corosync.conf and I see with tcpdump that they're all using
different multicast addresses:
239.192.96.8
239.192.173.163
239.192.93.197
How does corosync come up with the 'default' multicast address?
since corosync 2.x, corosync can choose multicast address based on
cluster name. Algorithm is same as with cman, so:
Base is always 239.192. or ff15::. Then clusterid is computed as can be
seen in totemconfig.c generate_cluser_id function (basically ASCII
addition of cluster_name). That cluster id is incremented by ring number
(so rings doesn't collide).
This value (16-bit) is ether directly added to IPv6 addr or taken as 2
8-bit values and added to IPv4 addr.
Regards,
Honza
-Steven Willis
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